GJ 887 e
GJ 887 e is a terrestrial planet orbiting the M1 V star GJ 887 in the constellation Piscis Austrinus. It lies about 11 light-years from Earth and was discovered in 2026 using the radial velocity method.
Is GJ 887 e in the Habitable Zone?
GJ 887 e orbits inside the inner edge of the habitable zone of GJ 887. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of GJ 887: 0.156–0.402 AU (conservative: 0.198–0.381 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on GJ 887 e
The equilibrium temperature of GJ 887 e is about 544 K (271 °C) — hotter than anywhere on Earth. This estimate ignores any atmosphere, which could change surface temperatures dramatically — Earth's greenhouse effect adds about 33 °C. It receives 20.90 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on GJ 887 e — one full orbit around GJ 887 — lasts 4.42 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.042 AU — closer to its star than Mercury is to the Sun.
How Was GJ 887 e Discovered?
GJ 887 e was discovered in 2026 using the radial velocity method, with observations from Multiple Observatories.
The radial velocity method measures the subtle wobble of a star caused by the gravitational pull of an orbiting planet, visible as periodic shifts in the star's light spectrum. The size of the wobble reveals the planet's minimum mass.
How Far Away Is GJ 887 e?
GJ 887 e is 10.7 light-years (3.3 parsecs) from Earth. Light arriving here tonight left the planet around the year 2016. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 188,320 years to make the journey.
The Host Star: GJ 887
GJ 887
- Spectral type
- M1 V
- Surface temperature
- 3,688 K (Sun: 5,772 K)
- Mass
- 0.50 M☉
- Radius
- 0.47 R☉
- Luminosity
- 0.0368 L☉
- Age
- 2.9 billion years (Sun: 4.6)
The GJ 887 Planetary System
GJ 887 e is one of 4 known planets in the GJ 887 system. Its siblings:
GJ 887 e — Complete Data
| Mass (best estimate) | 1.46 Earth masses |
|---|---|
| Orbital period | 4.42 days |
| Orbital distance | 0.042 AU |
| Equilibrium temperature | 544 K (271 °C) |
| Stellar irradiation | 20.90× Earth |
| Distance from Earth | 10.7 light-years (3.3 parsecs) |
| Constellation | Piscis Austrinus |
| Discovery method | Radial Velocity |
| Discovery facility | Multiple Observatories |
| Discovery year | 2026 |
Data: NASA Exoplanet Archive, last updated 2026-02-26. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About GJ 887 e
Is GJ 887 e habitable?
No — GJ 887 e orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is GJ 887 e?
GJ 887 e is about 11 light-years from Earth in the constellation Piscis Austrinus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 188,320 years to get there.
How long is a year on GJ 887 e?
One orbit around GJ 887 takes 4.4 Earth days — short enough that 83 of its years would fit into one Earth year.
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